Istifta 310 — Music, singing & dancing

Some of the reciters, singers or chanters adopt the tunes of sinful people [i.e., haram entertainers] and then sing or chant with their tunes poems in praise of the Prophet (s.a.w.) and his family—the result is that the context is different from that of the sinful people, yet the tune is suitable to theirs. Is it forbidden to sing in this way? Is it forbidden to listen [in this case]?